Sarah and her friends the swim team are playing on the high dive. One of Sarah's friends throws her back pack, containing her swim supplies, into the pool from the high dive platform. The back pack we

Sarah and her friends the swim team are playing on the high dive. One of Sarah's friends throws her back pack, containing her swim supplies, into the pool from the high dive platform. The back pack weighs 50 N. When the back pack hits the water, it encounters a 50.0 N upward resistance force. The swim coach, who also happens to be the physics teacher says: "This is a great opportunity to discuss the forces exerted on Sarah's back pack!" Several students in the group made comments to the Coach about the back pack. Which student has the correct analysis of the forces and motion of the back pack?